More secure GitRepo volumes

git-repo-demo.yaml

# Example of using an InitContainer in place of a GitRepo volume.
# Unilke GitRepo volumes, this approach runs the git command in a container,
# with the associated hardening.
apiVersion: v1
kind: Pod
metadata:
  name: git-repo-demo
  annotations:
    seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
spec:
  initContainers:
    # This container clones the desired git repo to the EmptyDir volume.
    - name: git-clone
      image: alpine/git # Any image with git will do
      args:
        - clone
        - --single-branch
        - --
        - https://github.com/kubernetes/kubernetes # Your repo
        - /repo # Put it in the volume
      securityContext:
        runAsUser: 1 # Any non-root user will do. Match to the workload.
        allowPrivilegeEscalation: false
        readOnlyRootFilesystem: true
      volumeMounts:
        - name: git-repo
          mountPath: /repo
  containers:
    # Replace with your actual workload.
    - name:  busybox
      image: busybox
      args: ['sleep', '100000'] # Do nothing
      volumeMounts:
        - name: git-repo
          mountPath: /repo
  volumes:
    - name: git-repo
      emptyDir: {}